<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>Navo Portable Library: navo/algorithm/crypto/symmetric/base64.c源文件</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
</head>
<body onload='searchBox.OnSelectItem(0);'>
<!-- 制作者 Doxygen 1.7.3 -->
<script type="text/javascript"><!--
var searchBox = new SearchBox("searchBox", "search",false,'搜索');
--></script>
<div id="top">
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td style="padding-left: 0.5em;">
   <div id="projectname">Navo Portable Library&#160;<span id="projectnumber">Ver 1.0.20120827</span></div>
   <div id="projectbrief">Provides generic platform independent facilities.</div>
  </td>
 </tr>
 </tbody>
</table>
</div>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>首页</span></a></li>
      <li><a href="modules.html"><span>模块</span></a></li>
      <li><a href="annotated.html"><span>数据结构</span></a></li>
      <li class="current"><a href="files.html"><span>文件</span></a></li>
      <li id="searchli">
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="搜索" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="files.html"><span>文件列表</span></a></li>
      <li><a href="globals.html"><span>全局定义</span></a></li>
    </ul>
  </div>
<div class="header">
  <div class="headertitle">
<h1>navo/algorithm/crypto/symmetric/base64.c</h1>  </div>
</div>
<div class="contents">
<a href="base64_8c.html">浏览该文件的文档。</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */</span>
<a name="l00011"></a>00011 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#pragma optimize(&quot;t&quot;, on)</span>
<a name="l00013"></a>00013 <span class="preprocessor"></span><span class="preprocessor">#endif  </span><span class="comment">/* #ifdef _MSC_VER */</span>
<a name="l00014"></a>00014 
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;<a class="code" href="base64_8h.html" title="Base64.">base64.h</a>&quot;</span>
<a name="l00016"></a>00016 
<a name="l00017"></a>00017 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#include &lt;cstring&gt;</span>
<a name="l00019"></a>00019 <span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {
<a name="l00020"></a>00020 <span class="preprocessor">#else</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00022"></a>00022 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00023"></a>00023 
<a name="l00024"></a><a class="code" href="group__Base64.html#ga6b35759edb047799ce26f6fa041331d2">00024</a> NV_IMPL <span class="keywordtype">void</span> <a class="code" href="group__Base64.html#ga6b35759edb047799ce26f6fa041331d2" title="设置Base64密钥">base64_set_key</a>(<a class="code" href="structbase64__key.html" title="Base64密钥">base64_key</a>* key, <span class="keywordtype">void</span>* src_key)
<a name="l00025"></a>00025 {
<a name="l00026"></a>00026     <span class="keywordtype">int</span> i;
<a name="l00027"></a>00027     <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* esk = key-&gt;<a class="code" href="structbase64__key.html#a38431a610bcf671506dc0cf73852ccc9" title="加密钥">esk</a>;
<a name="l00028"></a>00028     <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* dsk = key-&gt;<a class="code" href="structbase64__key.html#ac1d25357f33f654be5bd3563320ef101" title="解密钥">dsk</a>;
<a name="l00029"></a>00029 
<a name="l00030"></a>00030     memcpy(esk, src_key, <span class="keyword">sizeof</span>(key-&gt;<a class="code" href="structbase64__key.html#a38431a610bcf671506dc0cf73852ccc9" title="加密钥">esk</a>));
<a name="l00031"></a>00031 
<a name="l00032"></a>00032     <span class="keywordflow">for</span> (i = 0; i &lt; <span class="keyword">sizeof</span>(key-&gt;<a class="code" href="structbase64__key.html#a38431a610bcf671506dc0cf73852ccc9" title="加密钥">esk</a>); ++i) {
<a name="l00033"></a>00033         dsk[esk[i] - BASE64_KEY_MIN] = (<a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>)i;
<a name="l00034"></a>00034     }
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036 
<a name="l00037"></a>00037 NV_IMPL <span class="keywordtype">void</span> __base64_encrypt(<a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* esk, <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* dst,
<a name="l00038"></a>00038                             <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* src, <span class="keywordtype">size_t</span> cnt)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040     <span class="keywordflow">while</span> (cnt &gt;= 3) {
<a name="l00041"></a>00041         <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a> j = ((src[0] &lt;&lt; 4) | (src[1] &gt;&gt; 4)) &amp; 0x3F;
<a name="l00042"></a>00042         dst[0] = esk[src[0] &gt;&gt; 2];
<a name="l00043"></a>00043         dst[1] = esk[j];
<a name="l00044"></a>00044         dst[2] = esk[((src[1] &lt;&lt; 2) | (src[2] &gt;&gt; 6)) &amp; 0x3F];
<a name="l00045"></a>00045         dst[3] = esk[src[2] &amp; 0x3F];
<a name="l00046"></a>00046         dst += 4; src += 3; cnt -= 3;
<a name="l00047"></a>00047     }
<a name="l00048"></a>00048     <span class="keywordflow">if</span> (cnt) {
<a name="l00049"></a>00049         dst[0] = esk[src[0] &gt;&gt; 2];
<a name="l00050"></a>00050         <span class="keywordflow">if</span> (cnt == 2) {
<a name="l00051"></a>00051             dst[1] = esk[((src[0] &lt;&lt; 4) | (src[1] &gt;&gt; 4)) &amp; 0x3F];
<a name="l00052"></a>00052             dst[2] = esk[(src[1] &lt;&lt; 2) &amp; 0x3F];
<a name="l00053"></a>00053         } <span class="keywordflow">else</span> {
<a name="l00054"></a>00054             dst[1] = esk[(src[0] &lt;&lt; 4) &amp; 0x3F];
<a name="l00055"></a>00055             dst[2] = <span class="charliteral">&#39;=&#39;</span>;
<a name="l00056"></a>00056         }
<a name="l00057"></a>00057         dst[3] = <span class="charliteral">&#39;=&#39;</span>;
<a name="l00058"></a>00058     }
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060 
<a name="l00061"></a>00061 NV_IMPL <span class="keywordtype">void</span> __base64_decrypt(<a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* dsk, <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* dst,
<a name="l00062"></a>00062                             <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a>* src, <span class="keywordtype">size_t</span> cnt)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064     <a class="code" href="group___xE6_x95_xB4_xE5_x9E_x8B_xE5_xAE_x9A_xE4_xB9_x89.html#gae1affc9ca37cfb624959c866a73f83c2" title="8比特无符号整型">uint8_t</a> I, J;
<a name="l00065"></a>00065     <span class="keywordflow">while</span> (cnt &gt;= 4) {
<a name="l00066"></a>00066         I = dsk[src[1] - BASE64_KEY_MIN];
<a name="l00067"></a>00067         J = dsk[src[2] - BASE64_KEY_MIN];
<a name="l00068"></a>00068         dst[0] = (I &gt;&gt; 4) | (dsk[src[0] - BASE64_KEY_MIN] &lt;&lt; 2);
<a name="l00069"></a>00069         dst[1] = (I &lt;&lt; 4) | (J &gt;&gt; 2);
<a name="l00070"></a>00070         dst[2] = (J &lt;&lt; 6) | dsk[src[3] - BASE64_KEY_MIN];
<a name="l00071"></a>00071         dst += 3;
<a name="l00072"></a>00072         src += 4;
<a name="l00073"></a>00073         cnt -= 4;
<a name="l00074"></a>00074     }
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span>}
<a name="l00079"></a>00079 <span class="preprocessor">#endif </span><span class="comment">/* #ifdef __cplusplus */</span>
<a name="l00080"></a>00080 
<a name="l00081"></a>00081 
</pre></div></div>
</div>
<!--- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>全部</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>数据结构</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>文件</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>函数</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>变量</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>类型定义</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>宏定义</a></div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<hr class="footer"/><address class="footer"><small>Generated at 2015年七月16日 星期四 12:00:37 for Navo Portable Library by&#160;
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.3 </small></address>
</body>
</html>
